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Difference between Good for you and Good of you

good for you—(non-predicative) used as an expression of approval:

  • You’re not about to lay cash on the line without decent answers to a question or two. Good for you.

good of you—(predicative) used in approval of smb.’s kind or generous act:

  • It was very good of you to help Harry with his bike. I’m proud of you.